Utility-scale thermal battery storing electricity as heat in graphite, returned as electricity on demand for multi-day peaks.
Fourth Power thermal battery storage system charges graphite blocks with off-peak electricity and holds the heat in an insulated inert environment for days or weeks. Discharge converts the heat to light that thermophotovoltaic cells turn back into electricity on demand.
The baseline offers 20 megawatts electric and one gigawatt-hour over 50 hours on about one acre, scaling past 100 hours with sub-10-second dispatch and a 30-plus-year life.
Rondo Energy
Heat Batteries
rondo.com
Antora Energy
Thermal Batteries
antora.com
MGA Thermal
Thermal Storage Blocks
mgathermal.com
| Attribute | Fourth Power thermal battery storage system | Heat Batteries | Thermal Batteries | Thermal Storage Blocks | |
|---|---|---|---|---|---|
| Provider | | | | | |
| Founded | 2021 | 2020 | 2017 | 2019 | |
| Sells To | Enterprise, Government | Enterprise | Enterprise | — | |
| Pricing Model | Recurring | Recurring | Recurring | — | |
| Ownership | Venture-backed | Private equity-backed, Venture-backed | Private equity-backed, Venture-backed | — |
Provider
Founded 2021
Sells To Enterprise, Government
Pricing Model Recurring
Ownership Venture-backed
Provider
Founded 2020
Sells To Enterprise
Pricing Model Recurring
Ownership Private equity-backed, Venture-backed
Provider
Founded 2017
Sells To Enterprise
Pricing Model Recurring
Ownership Private equity-backed, Venture-backed
Provider
Founded 2019
Sells To —
Pricing Model —
Ownership —
Utility-scale battery storage system for grid stabilization and renewable energy.
Mobile battery energy storage that delivers on-site power without a grid upgrade.
Iron-Air Battery System provides grid-scale, multi-day energy storage using reversible iron-air chemistry.
Utility-scale battery storage system for grid stabilization and renewable energy.
Mobile battery energy storage that delivers on-site power without a grid upgrade.
Iron-Air Battery System provides grid-scale, multi-day energy storage using reversible iron-air chemistry.